Adaptive Message Judgment in Vehicle Networks
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Solution Overview
Problem
Existing information processing devices in vehicles face challenges in accurately judging the correctness of messages due to varying communication intervals and data lengths, which can differ by vehicle type and environment, making uniform reference values ineffective.
Innovation Solution
An information processing device that calculates and learns a reference value for message reception intervals or change amounts, using these values as judgment references to determine the normalcy of periodic messages transmitted by other devices, allowing for adaptive and accurate message judgment without requiring pre-set values for each vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform reference values are used for message judgment, then the device complexity is reduced, but the measurement precision of message correctness judgment deteriorates due to varying communication intervals and data lengths across different vehicle types and environments
Solution Approach 1:
The patent applies dynamics by transitioning from static uniform reference values to dynamic learned reference values. The ECU dynamically adapts the reference values for communication intervals and data lengths based on actual message patterns observed during a learning period, allowing the system to adjust to different vehicle types and environments automatically without manual reconfiguration
Solution Approach 2:
The patent changes the parameters used for message judgment from fixed uniform values to variable learned values. By monitoring actual communication intervals and data lengths during the learning period and updating reference values accordingly, the system adapts parameter values to match specific vehicle configurations, thereby improving judgment accuracy while maintaining simple operation
2Measurement precision
If learned reference values are used for message judgment, then the measurement precision of message correctness judgment is improved, but the loss of time increases due to the learning period required before normal operation
Solution Approach 1:
The patent applies preliminary action by performing the learning process during the initial startup phase or manufacturing period, before the vehicle enters normal operation. This allows reference values to be established in advance based on actual message patterns, so that accurate message judgment can be achieved immediately when needed without delaying normal operations
Solution Approach 2:
The patent uses periodic action by implementing the learning process as a time-limited periodic operation that occurs during specific phases (startup or manufacturing). The learning period operates periodically to collect message data and establish reference values, after which the system transitions to normal judgment operations using the learned parameters
Data Source
AI summary
An information processing device is connected via a communication network to a different information processing device. In the information processing device, a periodic message is received as a learning periodic message from the different information processing device. A reception interval is calculated between (i) a one message of the learning periodic message and (ii) a different message that is received immediately before the one message. A reference value of the reception interval of the periodic message is judged based on the calculated reception interval. The reference value is used as a judgment reference to judge whether or not a judgment target periodic message is normal. The judgment target periodic message is the periodic message transmitted by the different information processing device after the reference value is determined.